What Developers Get Wrong About Business Requirements

Most developers are good at building what they're told to build. That sounds like a compliment, and it's meant as one, but it's also the root of why so much business software misses. Because a business doesn't actually know how to tell a developer what to build, at least not in the form a developer expects. And a developer who takes the instructions at face value builds the wrong thing, precisely.

I've spent enough time on both sides of this to see where it goes wrong. Here's what developers most often get wrong about business requirements, and why it matters to you if you're hiring one.

They treat what you say as the whole truth

When a business owner says "I need a system to track orders," a developer often hears a complete instruction. So they build an order tracker. What they miss is that "track orders" is the tip of an iceberg, under it sits how your orders actually flow, the exceptions, the approvals, the one customer who does everything differently.

A good requirement isn't what you said, it's what you meant, and the two are rarely the same. The developer's job, though many skip it, is to dig under the sentence and find the real need. When they don't, you get software that does exactly what you asked and nothing you actually needed.

They assume your process is logical and consistent

Developers think in clean logic: if this, then that. Real businesses don't run on clean logic. They run on history, exceptions, personal relationships, and "we've always done it this way."

A developer who assumes your process is tidy builds for the tidy version, and then everything breaks on contact with your actual messy, human operation. The exceptions they dismissed as edge cases turn out to be a third of your business. Good requirements capture the mess, not the ideal, and that takes someone willing to ask "but what happens when it doesn't go to plan?"

They don't ask why

This is the big one. A developer is handed a requirement, "add a button that exports this to Excel", and they build the button. They never ask why you want it. Had they asked, they'd have learned you export to Excel to email a summary to your manager every morning, and that the real need was an automatic daily summary, not a button you still have to click.

The "why" behind a requirement almost always reveals a better solution than the literal request. Developers who build the request without understanding the goal deliver features that technically work and practically miss.

They confuse "what you asked for" with "what solves your problem"

A business will often ask for a specific feature because it's the only solution they can picture. But you're the expert in your business, not in software, so the solution you imagine is limited to what you know exists. A developer's real value is knowing solutions you don't, and matching them to your actual problem.

When a developer just builds your imagined solution, you're paying an expert to switch off their expertise. The requirement should describe the problem, and the developer should own finding the best answer to it, together with you.

Why this matters when you're hiring

If you're a business owner, here's the practical takeaway. The developer who nods and says "sure, I'll build exactly that" is not necessarily the safe choice. The one who slows down, asks why, questions your assumptions, and sometimes tells you your idea won't do what you hope, that's the one who'll actually solve your problem. It feels less comfortable and it's far more valuable.

This is also why understanding requirements is a different skill from writing code, and why some of the best-built software still fails. I wrote about that in why most business software projects fail before development even starts, and about how to describe your own needs clearly in how to turn a messy business process into a software specification.

How I approach it

When someone brings me a requirement, my first job isn't to build it, it's to understand the business behind it and the problem underneath it. I ask why, I look for the exceptions, and I'll suggest a different approach if I think it serves you better than the one you came in with. It's slower at the start and it's the reason the result actually fits.

If you're planning software and want someone who'll understand what you mean, not just what you say, tell me what you're trying to solve. You can see the kind of systems that came from this on my work page.

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